The most interesting part of that article for me is that 4sq is moving into the local merchant coupon business against Groupon and LivingSocial. With Yelp pushi

The most interesting part of that article for me is that 4sq is moving into the local merchant coupon business against Groupon and LivingSocial. With Yelp pushing their own deals and Facebook with Deals how soon before this discount bubble bursts?